Combination set-down and screw-off packer



J. D. NIXON CbMBINATION SET-DOWN AND SCREW-OFF PAGKER Filed Jan.

M m w n 0 Patented 0a. 21, 1924.

umrso FATENT OFFICE.

JEDDY D. NIXON, OF HOUSTON, TEXAS, ASSIGNOR TO W. K. M. COMPANY, 1'NC.,OF HOUSTON, TEXAS.

COMBINATION SET-DOWN AND SCREW-OFF PACKEBZ.

Application filed January 22, 1924. Serial No. 687,695.

To all whom it may concem:

Be it known that I, JEDDY D. NIxoN, a citizen of the United States,residing at Houston, Harris County, Texas, have invented a certain newand useful Improvement in Combination Set-Down and Screw- Oif Packers,of which the following is a specification.

, My invention relates to an improved combination packer for Wells andpertains more particularly to packers employed in the pumping of deepwellsfor oil or water.

It is an object of my invention to provide a packer which may, ifdesired, be arranged to operate as a set-down packer in which nounscrewing operation is necessary, and which may also be employed ifdesired as a screw-01f packer where such a type of device is desirable.

It is also an object to provide a device of this sort which may bepositively operated without difiiculty, and which comprises a minimumnumber of parts, thus making it economical in construction and easy tooperate.

Referring to the drawing herewith, wherein like numerals of referenceare employed to designate like parts in both the views, Fig. 1 is acentral longitudinal section through a packer constructed in accordancewith my invention. F ig. 2 is a broken central longitudinal sectionthrough the device showing the parts in different positions than thoseshown in Fig. 1.

I contemplate that the packer shown in the drawing may be used to closeoff the space between the tubing and the casing in a well which is beingpumped, and the con- ,struction is intended to close off the escape ofgas or other fluid upwardly between the ,tubing and the casing duringthe pumping the coupling is increased at. 6 so that the outer diameteris spaced slightly from the interior wall of the casing. The inner faceof the coupling is extended inwardly and threaded at 7 for connectionwith the tube 8.

The tube 8 has its wall slightly thickened at its upper end 9, toprovide a threaded portion 10 of a slightly greater outer diameter thanthe remaining portion of the tube. This threaded portion is adapted toengage within the coupling 4 in such manner that the said coupling maybe screwed downwardly to release its connection with said tube andremain out of engagement with the tube below the threaded portion. Thelower threaded internally at 12 for connection with I the tubing of thewell. The nipple 11 is of greater thickness than the tube 8, and extendsoutwardly therefrom at its upper end to provide a shoulder 13 whichforms a seat for the sleeve 14 of rubber or other compressiblecomposition forming the expansible packer.

The packer 14 is preferably divided into two parts, the lower sleeve 14and the upper ring or collar 15 between the said sleeve and the lowershoulder 16 of the coupling 4. The collar 15 is of the same material asthe packer sleeve but is easily removable when desired so that thecoupling 4 may be screwed downwardly out of threaded conneetion with thetube 8.

In the operation of the packer, the device may be screwed into thetubing at any pointalong its length where it is desired to set the same.The tubing will then be introduced into the well until the lower endthereof contacts either with the bottom of the well, or until thecentral portion of the nipple 11 rests upon the upper end of the linerWithin the well. If the weight of the tubing is then rested upon thepacker, the friction of. the lower end against the bottom of the hole orwith the upper end of the liner will prevent its rotation so that thecoupling 4 may be screwed downwardly upon the tube 8 and thus compressthe packing 14 and 15,- expanding it outwardly against the wall of thecasing in an obvious manner so as to close the space between the casingand the tube by forming the upper end 9 of the tube 8 of a largerdiameter than the remaining tube, the coupling 6 need be screwed downbut a short distance before it will be released, and will then telescopedown over said tube to compress the packing. The tube itself, with thepacking thereon, will not be rotated. This is called a screw-0d packerbecause the unscrewing of the coupling 4 from the tube 8 is necessary tocompress the packing. Ordinarily, it will not be necessary to screw thecoupling down out of threaded engagement with the upper end of the tubein order to sufliciently expand the packer, but it this does becomenecessary, the weight of the tube upon the coupling 4:, after it hasbeen disengaged ntrom the tube, will be suflicient to entirely expandthe packer.

This device may be used as a set-down packer by removing the upper ringor collar 15 of the packer, and by then screwing the coupling 4downwardly to a position below the threaded portion 9, so that the tubeand the packer will hang on the lower end or the coupling 4approximately as shown in Fig. 2. The device may be then lowered intothe well until the lower end of the tubing strikes the bottom of thewell or the upper end of the liner and the lowering of the tubingthereafter will force the coupling l downwardl to expandthe packingagainst the casing 1%, as illustrated in Fig. 2.

The combining of the set-down and the screw-oil features makes thisdevice an especially desirable one for use in connection with pumpingoperations and also in cansing wells to flow which otherwise would notthemselves produce oil through the casing alone. The set-downconstruction may be employed where it is not desirable to rotate thetubing, but the screw-oil construction will be employed where conditionsallow, and it will be noted that the tool is exceedingly simple andeconomical to construct.

Further objects and advantages of my invention will be apparent to thoseskilled in the without "further description.

dfhat T claim as new, and desire to protect by Letters Patent is:

1. A v ell packer comprising a pipe mem ber, a coupling thereon, a tubehaving an upper end of increased outer diameter threaded connection insaid coupling, a lower nipple on said tube, and a packing sleeve on saidtube between said coupling and said nipple said coupling being adaptedto be screwed downwardly out of threaded engagement with said tube toexpand said packing 2. A well packer comprising an upper tubular member,a coupling therein having manner force the downward movement of saidcoupling to compress said packing sleeve longitudinally.

3. A well packer comprising a tubular member adapted to be connectedwith the pump tubing, a coupling on the lower end of said member, aninternally threaded lower end on said coupling of smaller internaldiameter than the remainder 0t said coupling, a'tube having an enlargedupper threaded end to fit within said coupling, a lateral shoulder onthe lower end of said tube, a packing sleeve on said tube above saidshoulder, and a packing ring above said sleeve, said coupling bearingagainst said ring.

4. A well packer for connection in string or" tubing, including acoupling having its lower end decreased in internal diameter andthreaded, a tube having its cylindrical upper end enlarged in diameterand threaded to engage within said coupling, a packing sleeve on saidtube, a sunporting shoulder on said tubing for s sleeve, and a separatepacking ring between said sleeve and said coupling for the purposedescribed.

5. A well packer for connection in ast of tubing for wells, including acoupling duced in internal diameter at its lower e and threaded, a tubehaving its upper e enlarged and threaded to engage within sa coupling, asupporting shoulder on lower-end of said tube and a packing i on saidtube between said shoulder coupling,

6., A well packer for connection a pipe including a coupling membetubehaving a detachable connection wmi the lower end thereof, supportingshon on the lower end oi said tube, a pa sleeve of compressible materialon said and seated on said shoulder, means disengage said coupling fromsaid tube a compress said packing sleeve longitudinall ln testimonywhereoi l hereunto ignature this 16th day of January, A. l). 92

NLX ODH

